TNF and hemophagocytic syndrome: Other tests related to HLH were conducted, and the results were: soluble interleukin-2 receptor alpha chain, 20,229 pg/ml (normal range <6,400 pg/ml); natural killer cell activity, 14.43% (normal range ≥15.11%); IL-10, 1,125.41 pg/ml (normal range <4.91 pg/ml); IL-6, 55.06 pg/ml (normal range <5.30 pg/ml); tumor necrosis factor α (TNF- α), 3.11 pg/ml (normal range <2.31 pg/ml).